已知抛物线
,圆
.
(1)在抛物线
上取点
,
的圆周上取一点
,求
的最小值;
(2)设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78663869ff5d83d5804f37a5b8dbc6b8.png)
为抛物线
上的动点,过
作圆
的两条切线,交抛物线
于
、
点,求
中点
的横坐标的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4428756f1088ce78ed97cbcea99775f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b55ecabbaab74f20205e63e5c09a5bc.png)
(1)在抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/631e6a0ed0f1f40e1072ac6a21d05e7a.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78663869ff5d83d5804f37a5b8dbc6b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92bdeb3f8546ccca90e8e9787e74c246.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
更新时间:2016-12-03 11:01:32
|
【知识点】 抛物线
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解答题-问答题
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适中
(0.65)
【推荐1】已知动圆过定点
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(2)设
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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您最近一年使用:0次
解答题-应用题
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适中
(0.65)
【推荐2】已知某条河上有抛物线型拱桥,当水面距拱顶5米时,水面宽8米,一条木船宽4米,木船露出水面上的部分高为0.75米.
(1)建立适当的坐标系,求拱桥所在抛物线的方程;
(2)当水面上涨0.5米时,木船能否通行?
(3)当水面上涨多少米时,木船开始不能通行?
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(2)当水面上涨0.5米时,木船能否通行?
(3)当水面上涨多少米时,木船开始不能通行?
您最近一年使用:0次